Impregnation sealant for electronic components
AssigneeHenkel AG & Co. KGaA
InventorsPatrick O'Dwyer, Greg Clarke, Peter Joseph Wrobel
Life of this patent
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Abstract
The present invention relates to an anaerobically curable impregnation sealant composition and methods thereof containing a (meth)acrylic monofunctional monomer with a hydrophobic moiety, a (meth)acrylic monofunctional monomer with a hydroxyl group, a modified polyester urethane methacrylate resin having a weight average molecular weight of from about 8000 to about 18000 g/mol, and triallylisocyanurate, triallylcyanurate, or derivatives thereof, or a combination thereof. The present invention particularly relates to a sealant composition for impregnation to plastic and metal substrates that also provides resistance to thermal cycling.
Claims31
An anaerobically curable impregnation sealant composition comprising:
- (a) at least two (meth)acrylic monofunctional monomers containing a C4-C20 alkyl hydrophobic moiety, wherein (a) comprises lauryl (meth)acrylate and trimethylcyclohexyl (meth)acrylate;
- (b) at least one (meth)acrylic monofunctional monomer containing a hydroxyl group;
- (c) at least one modified polyester urethane methacrylate resin having a weight average molecular weight of from about 8000 to about 18000 g/mol and a glass transition temperature of less than ˜20° C., present in an amount ranging from about 10 to 30 wt. % based on total weight of the composition, wherein the amount of (c) is selected such that viscosity of the composition is suitable for impregnation;
- and
- (d) triallylisocyanurate, triallylcyanurate, or derivatives thereof, or a combination thereof, present in an amount of about 5 to 15 wt. % based on total weight of the composition.
An anaerobically curable impregnation sealant composition comprising:
- (a) at least two (meth)acrylic monofunctional monomers containing a hydrophobic moiety, wherein (a) comprises lauryl (meth)acrylate and trimethylcyclohexyl (meth)acrylate;
- (b) at least one (meth)acrylic monofunctional monomer containing a hydroxyl group, and is present in an amount from about 3 to about 45 wt. % based on total weight of the composition;
- (c) at least one modified polyester urethane methacrylate resin having a weight average molecular weight of from about 8000 to about 18000 g/mol, a glass transition temperature of less than −40° C., and present in an amount ranging from about 10 to 30 wt. % based on total weight of the composition;
- and
- (d) triallylisocyanurate, triallylcyanurate, or derivatives thereof, or a combination thereof;
- and
- wherein (c) the at least one modified polyester urethane methacrylate resin comprises the reaction product of reactants:
- (i) a polyester diol,
- (ii) toluene diisocyanate, and
- (iii) a polymerizable methacrylate acid ester;
- wherein viscosity of uncured sealant composition is less than 100 mPa·s.
A method of manufacturing an anaerobically curable composition comprising:
- step a) providing (a) at least two (meth)acrylic monofunctional monomers containing a C4-C20 alkyl hydrophobic moiety and (b) at least one (meth)acrylic monofunctional monomer containing a hydroxyl group, wherein (a) comprises lauryl (meth)acrylate and trimethylcyclohexyl (meth)acrylate;
- and
- step b) combining said monomers with (c) at least one modified polyester urethane methacrylate resin having a weight average molecular weight of from about 8000 to about 18000 g/mol, and (d) triallylisocyanurate, triallylcyanurate, or derivatives thereof, or a combination thereof;
- wherein a reaction weight ratio of equivalents of the modified polyester urethane methacrylate resin to (meth)acrylic monomers containing a hydrophobic moiety and (meth)acrylic monofunctional monomers containing a hydroxyl group is about 1:0.5 to about 1:6.
Dependencies are inferred from the claim text.